IPv6 support for LibVNCServer, part three: make reverse connections IPv6-capable.

Besided making libvncserver reverseVNC IPv6-aware, this introduces some changes
on the client side as well to make clients listen on IPv6 sockets, too. Like
the server side, this also uses a separate-socket approach.

1 files changed, 62 insertions, 1 deletions

diff --git a/libvncclient/sockets.c b/libvncclient/sockets.c
index be9924a..01ec3a2 100644
--- a/libvncclient/sockets.c
+++ b/libvncclient/sockets.c
@@ -494,8 +494,9 @@ int
 ListenAtTcpPortAndAddress(int port, const char *address)
 {
   int sock;
-  struct sockaddr_in addr;
   int one = 1;
+#ifndef LIBVNCSERVER_IPv6
+  struct sockaddr_in addr;
 
   addr.sin_family = AF_INET;
   addr.sin_port = htons(port);
@@ -527,6 +528,66 @@ ListenAtTcpPortAndAddress(int port, const char *address)
     return -1;
   }
 
+#else
+  int rv;
+  struct addrinfo hints, *servinfo, *p;
+  char port_str[8];
+
+  snprintf(port_str, 8, "%d", port);
+
+  memset(&hints, 0, sizeof(hints));
+  hints.ai_family = AF_UNSPEC;
+  hints.ai_socktype = SOCK_STREAM;
+  hints.ai_flags = AI_PASSIVE; /* fill in wildcard address if address == NULL */
+
+  if (!initSockets())
+    return -1;
+
+  if ((rv = getaddrinfo(address, port_str, &hints, &servinfo)) != 0) {
+    rfbClientErr("ListenAtTcpPortAndAddress: error in getaddrinfo: %s\n", gai_strerror(rv));
+    return -1;
+  }
+
+  /* loop through all the results and bind to the first we can */
+  for(p = servinfo; p != NULL; p = p->ai_next) {
+    if ((sock = socket(p->ai_family, p->ai_socktype, p->ai_protocol)) < 0) {
+      continue;
+    }
+
+#ifdef IPV6_V6ONLY
+    /* we have seperate IPv4 and IPv6 sockets since some OS's do not support dual binding */
+    if (p->ai_family == AF_INET6 && setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, (char *)&one, sizeof(one)) < 0) {
+      rfbClientErr("ListenAtTcpPortAndAddress: error in setsockopt IPV6_V6ONLY: %s\n", strerror(errno));
+      close(sock);
+      freeaddrinfo(servinfo);
+      return -1;
+    }
+#endif
+
+    if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one)) < 0) {
+      rfbClientErr("ListenAtTcpPortAndAddress: error in setsockopt SO_REUSEADDR: %s\n", strerror(errno));
+      close(sock);
+      freeaddrinfo(servinfo);
+      return -1;
+    }
+
+    if (bind(sock, p->ai_addr, p->ai_addrlen) < 0) {
+      close(sock);
+      continue;
+    }
+
+    break;
+  }
+
+  if (p == NULL)  {
+    rfbClientErr("ListenAtTcpPortAndAddress: error in bind: %s\n", strerror(errno));
+    return -1;
+  }
+
+  /* all done with this structure now */
+  freeaddrinfo(servinfo);
+#endif
+
   if (listen(sock, 5) < 0) {
     rfbClientErr("ListenAtTcpPort: listen\n");
     close(sock);